Disazo dyestuffs and their production



Patented Mar. 26, 1935 i l, p .4.

UNITED STATES 3 DI SAZO- DYEs'rUFFs AND "THEIR P ODUC O F ENT ()F P Wilhelm Scheurer. and Georg Nieman'n, Ludwigshafen-on-the-Rhine, Germany; 7 assignors to General Aniline .Works, Inc., New York, N. Y.,- a corporation of Delaware 7 I No Drawing. Application November 14f'1933,

Serial No 698,017. In

solainl romeo-4s) The present invention relates to new disazo'dy e 1 stufis and a process of producing same.

We have found that valuable disazo dyestuffs worked upiigto'gether withrsthe colored material. Materials colored with the said dyestuffs are distinguished by brilliant yellow-red shades and the dyeings are entirely fast to vulcanization.

35 The following example will further illustrate thetnature of this invention but the invention is not restricted to this example. The parts; are by 50 weight.

the tetrazq c ompound is added to any aqueousal; kalinesuspension offllO'p'arts of Ii -(4 benzeneiand ethyl alcohol. coloring rubber and the'like. Materials of this 4 Tkind colored with the said dyestuff possess Germany November 22 Example '25 parts of ortho-dianisidine are tetrazotized in the usual manner and the resulting solution of H e et jphen' 'l) 3 methyl-5=pyrazolone cont iningfl. an excess of sodium bicarbonate. Whenf t e 'c'ou f" plirlgflis completed theiwhole is, boiled; filtered f and Washed" free from adhering 'salt. 'I'he'iresult ing brilliant yellow-red dyestuif is insoluble in rubber and in organic solvents, as for example It is suitable for V anexcellent fastness to vulcanization.

What we claim is:

r 1-. Disazo dyestuffs corresponding to the gen- {eral formula 0113.0. ooing;

wherein to eachof the nuclei marked A at, least one lower alkyl group is attached, the said dyestuifs being fast to vulcanization. v

2. Disazo dyestuffs corresponding to the general formula i; onno wherein to each of the nuclei marked A at least onev methyl group is attached, the said dyestuffs being fast to vulcanization.

'w e w e sa1:

7 3 Disazo'dyestufis-corresponding to the genwherein n stands for one of the numbers 1 and [5; The. process of producing dyestlufisj fastito vulcanization which comprises coupling 7 one molecular "proportionjof tetrazotized orthodianisidine with two rnolecular proportions'of least one lower alkyl group in the phenyl nui "6. The 5' process of producing disazo dyestuffs 1 5 1mm vulcanization which comprises coupling "one molecular proportion of tetrazotized orthoeral formula dianisidinewith two molecular proportions of a eral formula V 1-phenyl-3-methyl-5 pyrazolone ;.containlng n f 055.0 7 j 1 0,011, r r

' N o=o o= dianisidine with two molecular'proportions of 1- (4amethylphenyl) -r3-methyl-v5-pyrazolone.

inethyligroupsin-lthephenyl nuc1eus-,;wher ein n 2, thesaid dyestufis-beingzfasttovulcanization. i's 'one of the numbers 1 and 2. V 5 p I '4. The disazo dyestufi corresponding to -the 7.'- The process of producing disazo dyestuffs :1 j formula v V 1 v iasttoyulcanization which comprisescoupling cmo 0.0m l

-- 'oH3f=oHN=N-O N=N-Hooin N c=o' o=o-N-" a j Y \N su ,7 '2 the dyst fl being a St tojlulcanization. one molecular proportion not tetrazotized ortho- 30?- 8. Disazo dyestuffs corresponding to'the gen-r."

ongQon-N r. u Nf 40 v a r 9 r a a 1-phenyl-3-methyl-5 pyrazolone containing at: wherein to each of the nucleimarked A from oneto two lower alkyl groups'areattached, the said dyestuffs being fast to vulcanization. r

9. The processor producmgdisazo dyestuffs I from one to two lower alkyl groups in the .phenyl nucleus.

WILHELM SCHEURERQ qEoRG 

